The medical officers of all the armies won remarkable results in the quick healing of wounds and the reduction of death from battle casualties by establishing hospital stations immediately behind the fighting lines, regardless of danger. This brave course, together with the efforts of the enemy to annihilate them and their hospitals, caused much loss of life among them. The Medical Corps of the American Expeditionary Forces had 46 killed and 212 wounded in action, and a total of 442 casualties of all kinds. It was a comprehensive system of caring for the physical welfare of the American troops that was devised and carried out by the Medical Department. It had the fighting man constantly under its eye from the moment of his physical examination for induction into the army until he was examined for his final discharge. It analyzed his water supply, it examined his food and inspected his kitchens, it waged war against flies and mosquitoes in his camps, it made his environment sanitary and it devoted itself to his welfare if he was ill or wounded. One of the finest of all its multifold and varied works was the scheme for the reconstruction of disabled men and their preparation for a life as useful and successful as they would have enjoyed if unhurt. The principles of occupational therapy were applied to the treatment of ill or wounded soldiers in hospitals, beginning with manual work for the redevelopment of strength and dexterity and continuing with occupational aids for the restoring of the nervous system and the bringing about of a cheerful outlook. Nurse-teachers were prepared for this work by courses of intensive training, lasting from two to four months. By the time the tide of injured men returning to this country was at its height this reconstruction work was in progress in nearly fifty hospitals, some 700 officers and men of the army had been detailed to serve as instructors and assisting them were 1,200 nurse-teacher aids trained in occupational therapy.